Picture Perfect 4.6 Enterprise Edition User Manual - UTCFS Global ...

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50Picture Perfect 4.6 Enterprise EditionUser ManualConfigurationThe refresh program knows what databases are in the network and where they are located.The refresh_config table contains an entry for each history table to be refreshed on eachsubhost. The entries are created automatically whenever a subhost is defined using theControl/Hosts form. This table is for internal use by the refresh programs and is not accessible froma user interface. You do not need to change it.Table 4.Refresh Configuration TableColumn Name Type Descriptionid integer Unique row idhost_id integer Foreign Key - host tabletable_name varchar(19) table to be refreshedpoll_interval integer seconds to waitlast_poll_date integer yyyymmdd used for non-history refreshlast_poll_time integer hhmmss used for non-history refreshcurrent_id integer history subhost idmodify_datemodify_timeinteger yyyymmddinteger hhmmssRemote database access configurationThe hostname in the host table allows up to 64 alphanumeric characters. The hostname in the hosttable and the DBSERVERNAME in the Informix config file $INFORMIXDIR/etc/onconfig and the $INFORMIXDIR/etc/sqlhosts file must be identical. You do not need to edit onconfig orsqlhosts. Data is automatically written to these files during the Picture Perfect installation. It is forinformation purposes only.Polling intervalThe word “poll” refers to detecting changes between the nethost and the subhosts. Every machine inthe host table is polled for database refresh data based on a configurable time interval in therefresh_config table. Polling is configured only for history tables. The refresher executes for eachsubhost in the network, then sleeps for the poll interval and then begins again. Only subhosts thatare set up in the nethost with configure_online = ‘Y’ are refreshed.Note: Global tables other than history tables are immediately refreshed by Informix ER and do notuse poll interval times.Log file message layoutThe refresher log file is /cas/log/rfs.. Each entry indicates which table it is refreshingon the subhost as needed. Informix SQL and ISAM error codes are used for logging error messagesinstead of the full Informix textual error message.
Chapter 4Managing your network database51To get an explanation of the error codes, use the Informix program finderr followed by the errorcode. For example:$ finderr -908-908 Attempt to connect to database server (servername) failed.The program or application is trying to access another database server but hasfailed. Note the server name in the current statement.The desired database server is unavailable, or the network is down or iscongested. Ask your DBA and system administrator to verify that the server andnetwork are operational. If the network is congested, use the environmentvariables INFORMIXCONTIME and INFORMIXCONRETRY to tune connection timing. Forinformation on setting these environment variables, see the Informix Guide toSQL: Reference.Refreshing database history tablesThree history tables are stored on each Picture Perfect system. The nethost collects alarm history,badge history, and operator history by polling each subhost for newly created history data. This datais transferred to the nethost and inserted into the nethost alarm history, badge history, or operatorhistory tables. The poll time is a predetermined time interval setup automatically during installation.This information is stored in the poll_interval column of the refresh_config table. The nethostitself may generate alarms and operator activity, which are also inserted into the nethost historytables. The nethost does not generate badge activity since micros cannot be connected to it. Thecurrent_id column in the refresh_config table keeps track of the last history record ID fetchedand inserted from a subhost on a per-table, per-subhost basis.Enterprise Replication (ER)Picture Perfect Enterprise Edition 4.6 uses the IBM Informix ER tool to replicate database tableinformation between geographically distributed servers. This tool is an enhancement/replacement forthe Personnel/Badge and Categories "refreshers" technique used in previous Picture Perfectversions. Informix ER provides high availability and improved performance for high volume datatransfers at network latency limited to 300 ms. The benefits of Enterprise Replication include:• Updates from any host are now supported (as opposed to allowing changes only on thenethost).• Latency on one subhost no longer affects the refresh time on other subhosts.• Significantly improved performance.Note:The Notes are replicated for badge and person only.The Informix ER hierarchical tree topology preserves the current Picture Perfect configurationwherein the nethost is the master server (top level host) and the subhosts are subordinates. In theER topology, the nethost is the "root" server (database) and the subhosts are "non-root" servers forreplication. The servers continue to run in nethost and subhost modes (tps mode). The nethostserver has to be running for data changes done at any subhost to be replicated to the wholeinstallation.
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